I've tried all the compatable mode and reduce stutter, letter box. that one elitedonuts video and I've looked at other threads and the problem still persists. I've even tried reinstalling osu! but that also didn't work.

If you have an antivirus running, try disabling it, they have been known to cause some issues. In cases like these, uninstalling is most likely not going to be the solution and should only be used as a very last resort.